Summary:

- A recent study has found that parents tend to favor their older children and daughters over younger children and sons.
- The study, conducted by researchers at the University of Michigan, analyzed data from over 4,000 families and found that parents spent more time, money, and emotional resources on their firstborn and female children.
- The researchers suggest that this bias may be rooted in evolutionary and societal factors, such as the belief that older and female children are more likely to provide support and care for their parents in the future.